我刚开始使用带有Centos 7的Linode。我从来没有创建自己的服务器来托管网站，所以请提前道歉。
我已经阅读了每个stackoverflow（和其他网站）Q＆amp; A的问题，我似乎无法修复它。
我安装了Apache2并按照Linodes网站上的教程进行操作。服务器无法启动，我收到以下错误：
当我运行--systemctl status httpd.service
httpd.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled)
Active: failed (Result: exit-code) since Sun 2015-11-08 16:18:47 GMT; 10s ago
Process: 15662 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
Process: 15661 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=0/SUCCESS)
Main PID: 15661 (code=exited, status=0/SUCCESS)
Nov 08 16:18:47 london systemd[1]: Starting The Apache HTTP Server...
Nov 08 16:18:47 london httpd[15661]: httpd (pid 15652) already running
Nov 08 16:18:47 london kill[15662]: kill: cannot find process ""
Nov 08 16:18:47 london systemd[1]: httpd.service: control process exited, code=exited status=1
Nov 08 16:18:47 london systemd[1]: Failed to start The Apache HTTP Server.
Nov 08 16:18:47 london systemd[1]: Unit httpd.service entered failed state.
我跑的时候 - journalctl -xn
Logs begin at Thu 2015-10-22 20:33:26 BST, end at Sun 2015-11-08 16:18:47 GMT.
Nov 08 16:10:01 london systemd[1]: Starting Session 2857 of user root.
Subject: Unit session-2857.scope has begun with start-up
Defined-By: systemd
Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Unit session-2857.scope has begun starting up.
Nov 08 16:10:01 london systemd[1]: Started Session 2857 of user root.
Subject: Unit session-2857.scope has finished start-up
Defined-By: systemd
Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Unit session-2857.scope has finished starting up.
The start-up result is done.
Nov 08 16:10:01 london CROND[15635]: (root) CMD (/usr/lib64/sa/sa1 1 1)
Nov 08 16:15:02 london sshd[15647]: Received disconnect from 43.229.53.26: 11: [preauth]
Nov 08 16:18:47 london systemd[1]: Starting The Apache HTTP Server...
Subject: Unit httpd.service has begun with start-up
Defined-By: systemd
Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Unit httpd.service has begun starting up.
Nov 08 16:18:47 london httpd[15661]: httpd (pid 15652) already running
Nov 08 16:18:47 london kill[15662]: kill: cannot find process ""
Nov 08 16:18:47 london systemd[1]: httpd.service: control process exited, code=exited status=1
Nov 08 16:18:47 london systemd[1]: Failed to start The Apache HTTP Server.
Subject: Unit httpd.service has failed
Defined-By: systemd
Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Unit httpd.service has failed.
我完全不知道，也看不出我错在哪里。有人可以帮忙吗？
非常感谢！